/*
 * Copyright 2015-2025 the original author or authors.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

package sockslib.client;

import sockslib.common.AddressType;
import sockslib.utils.SocksUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.net.UnknownHostException;

/**
 * The class <code>RequestCmdReplyMessage</code> represents the message that
 * sent by SOCKS server when client sends a command request.
 *
 * @author Youchao Feng
 * @version 1.0
 * @date Mar 23, 2015 5:55:06 PM
 */
public class CommandReplyMessage implements SocksMessage {

  /**
   * Logger that subclasses also can use.
   */
  protected Logger logger = LoggerFactory.getLogger(CommandReplyMessage.class);

  /**
   * The bytes that received from SOCKS server.
   */
  private byte[] replyBytes;

  /**
   * Constructs an instance of {@link CommandReplyMessage} with an array of
   * bytes that received from SOCKS server.
   *
   * @param replyBytes The bytes that received from SOCKS server.
   */
  public CommandReplyMessage(byte[] replyBytes) {
    this.replyBytes = replyBytes;
  }

  /**
   * Returns <code>true</code> if the command request is success.
   *
   * @return If the command request is success, it will return
   * <code>true</code>.
   */
  public boolean isSuccess() {
    if (replyBytes.length < 10) {
      return false;
    }
    return replyBytes[1] == 0;
  }

  /**
   * Gets IP address from the bytes that sent by SOCKS server.
   *
   * @return IP address.
   * @throws UnknownHostException If the host is unknown.
   */
  public InetAddress getIp() throws UnknownHostException {
    byte[] addressBytes = null;

    if (replyBytes[3] == AddressType.IPV4) {
      addressBytes = new byte[4];
    } else if (replyBytes[3] == AddressType.IPV6) {
      addressBytes = new byte[16];
    }

    System.arraycopy(replyBytes, 4, addressBytes, 0, addressBytes.length);
    return InetAddress.getByAddress(addressBytes);
  }

  /**
   * Gets port from bytes that sent by SOCKS server.
   *
   * @return port.
   */
  public int getPort() {

    return SocksUtil.bytesToInt(replyBytes[replyBytes.length - 2], replyBytes[replyBytes.length
        - 1]);
  }

  /**
   * Returns the bytes that sent by SOCKS server.
   *
   * @return The bytes that sent by SOCKS server.
   */
  public byte[] getReplyBytes() {
    return replyBytes;
  }

  /**
   * Sets reply bytes.
   *
   * @param replyBytes The bytes that sent by SOCKS server.
   */
  public void setReplyBytes(byte[] replyBytes) {
    this.replyBytes = replyBytes;
  }

  /**
   * Gets the socket address.
   *
   * @return Socket address.
   */
  public SocketAddress getSocketAddress() {
    try {
      return new InetSocketAddress(getIp(), getPort());
    } catch (UnknownHostException e) {
      logger.error(e.getMessage(), e);
    }
    return null;
  }

}
